Xylem and phloem: sap-carrying function What they are Xylem and phloem are tissues that make up the vascular system of plants. Composition Xylem and phloem are formed by cells that originate from the meristems (primary and secondary). Tracheids (cells that lose protoplasm during maturation) are the most common elements in the xylem.
Molecular Evolution: Origin of Life on Earth Introduction The origin of life as a spontaneous event from lifeless matter seems like an absurd idea. It seems, but only now. For many philosophers of the past this was an irrefutable truth. The hypothesis called spontaneous generation prevailed. In the nineteenth century there was evidence that enabled researchers to overturn this hypothesis and create another.
Peroxisome: an important organelle of eukaryotic cells Introduction - What they are Eukaryotic cells have vesicles scattered throughout their cytoplasm. Some of these organelles are peroxisomes. Main characteristics of peroxisomes: Peroxisomes should not be confused with lysosomes, as there are differences between them.
Nutritious food helps prevent avitaminosis What it is Avitaminosis is a disease caused by a lack of vitamins. It is classified according to the missing vitamin, although sometimes it has its own name. Examples of Avitaminoses For example, vitamin A deficiency causes xerophthalmia (dry eyes); lack of vitamin B1 causes beriberi (trembling); pellagra (stiffness and peeling of the skin), is a lack of vitamin B3; pernicious anemia (resistant to iron treatment) occurs due to lack of vitamin B12; scurvy, for lack of vitamin C; Infant rickets and osteomalacia in adults are diseases generated by vitamin D deficiency.
Introduction Birds are bipedal, vertebrate, oviparous and homeothermic animals. They have feathers, beak and pneumatic bones. There are about 10,000 bird species (cataloged). They vary according to size, color and behavior. They inhabit all continents of planet Earth. Photos of birds Great tit Scientific classification Kingdom: Animalia Phylum: Chordata Class: Birds Order: Passeriformes Family: Paridae Genus: Parus Species: P.
Blood cells in a person with anemia What is anemia Anemia is a deficiency that negatively affects the production of hemoglobin (a substance in red blood cells). It is through hemoglobin that the blood carries oxygen to all parts of our body. Understanding Anemia Because all our cells rely on oxygen to perform their vital functions, anemia can lead to serious complications as it directly targets hemoglobin (the oxygen-carrying protein and iron).
Evolutionary Biology: studies the changes in living things over time What is Evolutionary Biology Evolutionary Biology is the area of biology that studies the common ancestry and descent of species. It also studies the changes that occur in living beings over time (biological evolution).
Potatoes: Great Source of Vitamin B12 Vitamin B12 Functions in the Body: Also called Cobalamin, vitamin B12 is of great importance in preventing and combating anemia. · Has restorative effect on neurological injuries caused by pernicious anemia. It acts on protein metabolism contributing to the absorption of amino acids by the body.
Testosterone Molecular Structure What is Testosterone Testosterone is a hormone produced in the testes (in men) and ovaries (in women). Men produce about thirty times more testosterone than women. Functions: - Determines the physical and behavioral characteristics of men: strengthening of bone structure; voice thickening at puberty; increased muscle mass; hair formation and maintenance (eg beard); maturation of sexual organs, activation of brain areas responsible for sexual desire.
Question and Answer on Cell Chemicals Question: What are the chemical components of a cell? Answer: The chemical composition of the cell may vary by cell type, but the essential chemical components present in all cells (animal and plant) are: carbon, hydrogen, oxygen, nitrogen, phosphate and sulfur (the latter two in smaller amounts). .
Biologist: a broad-acting professional Biologist's professional performance The biologist is a graduate of the Biological Sciences course and can work professionally in various areas. The biologist can work in various research areas at universities, pharmaceutical industries, zoos and research institutes.
Neurons: Transmission of nerve impulses Curiosities about the Human Nervous System: - Humans have about 86 billion neurons (nerve cells) in the brain. - Neurons are the cells responsible for transmitting nerve impulses. - Neurons produce neurotransmitters that act on the process of transmitting nerve impulses.
Thalamus: Transmitting Information to the Brain What It Is (Meaning) The thalamus is one of the regions of the diencephalon (the others being the hypothalamus and the pineal gland). It is an important nerve center located in the human brain. The word is of Greek origin, and thalamus means "room or enclosure" in Greek.
Hypothalamus: Important Structure of the Nervous System What It Is and Location The hypothalamus is a region of the mammalian brain, located below the thalamus and above the pituitary gland (in the central interior of the two cerebral hemispheres). It is a small part of the diencephalon and considered one of the most important structures of the central nervous system.
Coral snake: one of the most venomous in Brazil Summary of the main characteristics of venomous snakes - They have a triangular-shaped flat head; - Have the body covered with rough scales; - usually crawl slowly and straight; - They have two teeth that they use to inoculate the poison (toxin) in the attacking animal; - The tail of these snakes begins thickly, tapering suddenly.
Sounds made by animals: importance for survival Functions of sounds made by animals In Portuguese, as well as in foreign languages, there are names to designate the sounds made by different species of animals. Remember that many species of animals make sounds as a communication resource with other animals of the same species.
Jabuti-piranga: a common reptile in Brazilian fauna What it is Jabuti-piranga is a reptile present in forests and forests of the Northeast, North, Midwest and Southeast of Brazil. This species of jabuti has the scientific name of Chelonoidis carbonaria. It is very common in Brazil for people to have jabuti-piranga as a domestic pet.
Reptiles: Crocodiles, Snakes, Lizards and Tortoises Introduction The class of reptiles can be subdivided into three main orders according to specific physical characteristics. Chelonian Also called testudines, are reptiles that have carapace. The body of these reptiles is embedded in an oval shell consisting of a dorsal (carapace) and ventral (plastron).
Earthworm: An example of annelid What they are - biological definition Annelids are invertebrate, vermiform-looking animals that have their bodies segmented into rings. The Anellida phylum is large and diverse, with about 16,500 species (known so far). Habitat Annelids, according to species, live in terrestrial and marine environments.
Herbaceous Vegetation: Short Life Cycle Introduction (what it is) The term herbaceous vegetation defines what is popularly known as herbs. It does not designate a taxonomic group defined by scientists because it brings together many species not necessarily related to each other. The stems of these plants are flexible, that is, they are not woody like the stems of shrubs and trees.